Barracuda 18LP Family: ST39175LW/LC ST318275LW ... - Seagate

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36 Barracuda 18LP Product Manual, Rev. E J2 Pin 1 [1] Jumper Positions S E D S M E W P P D R ES R ES T P Force Single-Ended I/O Single-Ended or Low-Voltage Differential Delay Motor Start Enable Motor Start Write Protect Parity Disable Term. Power to SCSI Bus [2] J2 Jumper Plug (enlarged to show detail) J6 Drive Front J2 [1] Jumper position names shown here are not marked on the PCBA. They are shown here for reference only. Additional information on these functions is in Section 8.1.1. [2] This option is available on “LW” models only. Additional information on these functions is in Section 8.1.1. Figure 7c. Barracuda 18LP family drive option select header
Barracuda 18LP Product Manual, Rev. E 37 8.1.1 Function description J2 jumper installation SE On Off Jumper function description Forces drive to use single-ended I/O drivers/receivers only. Drive can operate on the interface in low voltage differential mode or single-ended, depending on the voltage state of the I/O “DIFFSNS” line. Default is no jumper on. DS ME Off Off Spindle starts immediately after power up—Default setting. Off On Drive spindle does not start until Start Unit command received from host. On Off Spindle Startup is delayed by SCSI ID times 12 seconds after power is applied, i.e., drive 0 spindle starts immediately when DC power connected, drive 1 starts after 12 second delay, drive 2 starts after 24 second delay, etc. On On Drive spindle starts when Start Unit command received from host. Delayed start feature is overridden and does not apply when ME jumper is installed. WP On Off PD On Off RES (2) Off Entire drive is write protected. Drive is not write protected. Default is no WP jumper installed. Parity checking and parity error reporting by the drive is disabled. Drive checks for parity and reports result of parity checking to host. Default is PD jumper not installed. Reserved jumper position. Default is no jumper installed. TP (“LW” model only) Off No terminator power is connected to drive terminators or SCSI bus I/O cable.* No jumpers on is factory default. On Drive supplies power to SCSI bus I/O cable.* A jumper on the TP position may be needed to power external terminators (see Section 9.8 and Figure 10). *See Figure 7c for pins used for Termpower. 8.2 Drive orientation The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive performance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, and these are the two preferred mounting orientations. 8.3 Cooling Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding the drive will not exceed temperature conditions specified in Section 6.4.1, “Temperature.” Specific consideration should be given to make sure adequate air circulation is present around the printed circuit board (PCBA) to meet the requirements of Section 6.4.1, “Temperature.” 8.3.1 Air flow The rack, cabinet, or drawer environment for the Barracuda 18LP drive must provide heat removal from the electronics and head and disc assembly (HDA). You should confirm that adequate heat removal is provided using the temperature measurement guidelines described in Section 6.4.1.
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